work plan for soil remediation, sampling and analysis plan, site ...

7.0 SITE RESTORATION AND DEMOBILIZATIONOnce all removal activities of contaminated soil are complete, restoration of the site will beperformed with demobilization of OHM personnel and equipment. Those activities describedin this section consist of the 1) supply and placement of common fill, 2) supply and placementof pavement, 3) grassing and seeding and 4) demobilization.Upon removal of all contaminated soil from the excavations or at the earliest time possible, allchemical analytical and geotechnical laboratory data required by the NAVFAC SpecificationNo. 05-94-4833 will be assembled for the soil that will be used to backfill the excavations.This data will be for both the uncontaminated soil and common fill acquired from anotherlocation. The SAP describes the methods and tests that will be implemented for chemicalanalysis. The geotechnical testing is discussed in Section 02200 of the specifications. Thisinformation will be submitted to the NTR for review. He will then issue authorization to OHMprior to the use of any fill materials.OHM will then load and transport all uncontaminated soil and common fill necessary to raisethe site to the grades shown in Drawings C-4 and C-5 of the design drawings. The soil will bedelivered by dump trucks and spread by a bulldozer in loose lifts no greater than 10 inchesthick. If necessary, a bridging lift greater than 10 inches thick is allowed for the fust liftplaced in each excavation to prevent piercing the compacted common fill with the earthmovingequipment. The soil will then be compacted by tracking construction equipment to attain a drydensity of 90 percent per ASTM D 1557.OHM will confm that the compaction criteria are fulfilled by in situ soil density testing at afrequency of no less than 1 test per 2,000 square feet per lift of fill placement. The testingprocedures will conform to those stated in Section 02200 of the specifications.When the area encompassing F Street is brought up to grade, an aggregate base and asphaltcement concrete surface will be placed for the restoration of this street as shown in NAVFACSpecification No. 05-94-4833, Drawing C-6. Any streets that may have been damaged willalso be reconstructed. For areas B and C and the area surrounding the road in area A that willnot receive pavement, a layer of topsoil will be placed. This will then be seeded to producegrass similar to that existing in the surrounding area as described in Section 5.1 of this WP andSection 02200 of the specification. A final survey as-built will then be performed. This asbuiltsurvey will be included in the Contractor’s Closeout ReportWhen all work associated with site restoration has been completed, OHM will demobilize fromthe site. All equipment and material that was mobilized to the site will be removed. All projectrelated debris, trash, and incidental waste, will be disposed appropriately. The disposal ofincidental waste will include any required analysis per Specification Section 01430. Prior tocomplete demobilization, the NTR or delegate will be requested to perform a site walk toinspect the site and approve substantial completion.OHM Pmjccl 16487WP work Plan May 1995Information herein is pmprictaty and confidential and to be used or releasr.d to others only with explicit written permission of OHM Rmwdiation ServicesCorp.7-l